Incidently, as well as forgetting to post my name, I forgot to mention the purpose of the large 20mm holes around the side of the black bucket. They are over-flow holes and are there to prevent water loss in the unlikely event that the 6mm holes (spaced 1 inch apart) on the base of the bucket get blocked.
Alan.
Posted on Jun 21, 2005, 8:58 PM from IP address 213.120.101.21